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Isothermal Drying Rate and Copolymerization of Vinyl Acetate/Alkyl Methacrylates  

Kim, Min-Sung (Department of Chemical Engineering, Dong-A University)
Seul, Soo-Duk (Department of Chemical Engineering, Dong-A University)
Publication Information
Polymer(Korea) / v.33, no.3, 2009 , pp. 230-236 More about this Journal
Abstract
Water soluble vinyl acetate/alkyl methacrylate copolymers were prepared by the emulsion copolymerization of vinyl acetate and various methacrylates such as methyl methacrylate (MMA) and ethyl methacrylate (EMA). Potassium persulfate (KPS) and ammonium persulfate (APS) were used as an initiator. Poly (vinyl alcohol) (PVA) was used as a protective colloid. The drying characteristics of the prepared poly(vinyl acetate-co-methyl methacrylate) (PVAc/PMMA), poly(vinyl acetate-co-ethyl methacrylate) (PVAc/PEMA) were studied using moisture meter at the temperature between 100 and $200^{\circ}C$. The significant results are described as follows. The activation energy of the isothermal drying process of the copolymers has the order of PVAc/PMMA> PVAc/PEMA> PVAc.
Keywords
vinyl acetate; alkyl methacrylate; isothermal drying rate; copolymerization;
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